Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win


Tables disappeared in mysql. How to diagnose ?

Posted on 2006-06-09
Medium Priority
Last Modified: 2010-04-22
In the mysql database, a number of tables disappeared. My email records show that at 6.29AM (PST) today, a transaction that involved several of the missing tables was conducted succesfully. I discovered the problem around 11AM (PST). The problem occured in that interval of time. In the interval, I did not access the server myself, so I suspect malicious action. Are there log files that I can use to I find out who connected to the database, and what they did ?


Question by:qtluong
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 15

Accepted Solution

DonConsolio earned 672 total points
ID: 16875165
If you started your mysql server with the "bianry log" option (--log-bin=file) you
can use the "mysqlbinlog" command.
LVL 22

Assisted Solution

pjedmond earned 664 total points
ID: 16973999
You may find something in the /var/log/mysql files *if* the database was stopped or started, but beyond that, if you haven't got logging available on the server, you won't see much.

You might want to have a quick look at:


as this may show who has logged onto the system (not whether they did anything in mysql)....but you can then have a quick look at what type of things that people who logged in during the time window have been doing by looking at their .bash_history. Of course this assumes that the individual logged in rather than connecting from a remote location to the mysql socket.

Unfortunately, there is probably little else you can do, *unless* any of your routers/firewalls etc have som form of log available.

(   (()
(`-' _\
 ''  ''

Assisted Solution

arpoodle earned 664 total points
ID: 17081843

The binlogs (if present) will show when the commands were executed, but only contain the net-result of any insert/update/delete/drop/create as required for replication, and won't tell you who did it.

If the 'user' connected locally, then you may have some luck looking in the .mysql_history files in the various shell account home directories.

Assuming your mysql users are locked down, you should know which database users have permissions to perform such an action, so look for those usernames in the shell account command histories too as a "mysql -u<user> -p" command.

combining the two histories will give you a good idea who did it, but as said, if the connection came from outside the server, then you will need to interrogate firewall or other access logs.


Featured Post


Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

​Being a Managed Services Provider (MSP) has presented you  with challenges in the past— and by meeting those challenges you’ve reaped the rewards of success.  In 2014, challenges and rewards remain; but as the Internet and business environment evol…
BIND is the most widely used Name Server. A Name Server is the one that translates a site name to it's IP address. There is a new bug in BIND (https://kb.isc.org/article/AA-01272), affecting all versions of BIND 9 from BIND 9.1.0 (inclusive) thro…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
In response to a need for security and privacy, and to continue fostering an environment members can turn to for support, solutions, and education, Experts Exchange has created anonymous question capabilities. This new feature is available to our Pr…
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question